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di•al•y•sis

Pronunciation: (dī-al'u-sis),[key]—n.,—pl.-sesPronunciation: (-sēz").[key]1. Physical Chem.the separation of crystalloids from colloids in a solution by diffusion through a membrane.
2. Biochem.the separation of large molecules, as proteins, from small molecules and ions in a solution by allowing the latter to pass through a semipermeable membrane.
3. Med.(in kidney disease) the process by which uric acid and urea are removed from circulating blood by means of a dialyzer.